360 balance problems

ya he retired and moved to montana, he did tell me that the rotating assembly was balanced, but ive heard hes in trouble with a lot of people that he did work for he used to work at a local auto parts store here in town b4 he left i've had the motor apart 4 times for different things, heads leaking,wrong head gaskets,twice! motor apart twice to check the bearings cause of the antifreeze getting into the oil, i think im gonna have to start over, again.
thanks for the help